September in Derbent is the windiest month of the year. In September, the weather in Derbent is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Derbent has 26 sunny, 3 partly cloudy, and 1 rainy day in September. The rains are usually light. September as well as June is considered the most comfortable time to visit Derbent.